Hi Esther,
In Ledger 9.0B (just released), you can copy budgets to forecasts and vice versa in the edit budgets (forecasts) function. Multi-select the accounts you want to copy. Why would you not want to move all the buckets?
To change a budget comparative to use the Forecast buckets instead, change "B" to "F" in the specification code (this may be on a .ColSpec line or embedded in a formula).
Make sense?
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Andrew Bates